Forward differences Jacobian assembler

Dmitry Yu. Naumov requested to merge endJunction/ogs:ForwardDifferences into master

An implementation of forward differences numerical Jacobian, similar to the existing central differences numerical Jacobian computation.

It takes less time to compute the Jacobian and shows better overall performance despite the reduced accuracy of the Jacobian.

The unit tests are same as those for the central differences Jacobian but with reduced error tolerance. Some refactorings were done trying to reduce duplicated test code. Unfortunately, the test structure is on the monolithic side and my separation efforts didn't succeed.

  1. Feature description was added to the changelog
  2. Tests covering your feature were added?
  3. Any new feature or behavior change was documented?
Edited by Dmitry Yu. Naumov

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